fix(input): input module depends on forms module (#5579)

* The input module currently depends on the forms module. This is not necessary, because the input is able to work without `NgModel` or a `FormControl` as well.

Author: devversion

src/lib/input/index.ts

@@ -18,7 +18,6 @@ import {
 } from './input-container';
 import {MdTextareaAutosize} from './autosize';
 import {CommonModule} from '@angular/common';
-import {FormsModule} from '@angular/forms';
 import {PlatformModule} from '../core/platform/index';
 
 
@@ -35,7 +34,6 @@ import {PlatformModule} from '../core/platform/index';
   ],
   imports: [
     CommonModule,
-    FormsModule,
     PlatformModule,
   ],
   exports: [